Improvement in machine for grinding and polishing bits



. 'J". SWAN. MACHINE FOR GRINDING'AND POLISHING BITS.

No. 99,970. Patented Feb. 15,. 1870.

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Letters Patent No. 99.970, dated February 15, 1870.

IMPROVEMENT IN MACHINE FOR GRINDING AND POLISHING- BITS.

The Schedule :elerred to in these Letters Patent and making part of the ame.

To all whom it may concern Be it known that I, JAMES SWAN, of Seymour, in the county of New Haven, and State of Connecticut, have invented a new andv useful Improvement in Machine for Manufacturing Bits; and I do hereby declare that the following is a full, clear, and'exact description thereof, which will enable others skilled in the artto make and use the same, reference beinghad to the accompanying drawings forming part of this specification.

This invention relates to a new and useful improvement in machinery for grinding the edges of angerbits, and giving the outside clear to the lips; and consists, firstly, in a telescopic shaft and mandrel for bolding, adjusting, and revolving the bit; secondly, in a mechanism for varying the position of the bit with legard to the grinder or buzz, so as to give the proper outside clear to the lips of the bit; and thirdly, in combination therewith, an adjustable grinder or buzz, and the necessary mechanisms for producing the vari ous motions necessary to carry out my invention, as will be hereinafter more fully set forth and described.

In theaccompanying plate of drawings- Figure 1 represents a top or plan view of the machine, showing the various parts in their proper positions.

Figure 2 is a side elevation partly in section, as through the line aim of fig. 3.

Figure 3 is a vertical cross-section of fig. 1, on the line y y. I

Similar letters of reference indicate. corresponding parts.

In all machines for grinding the edges of bits, their use has been heretofore confined to the reduction of the pod only, from the fact that owing to their construction they are incapable of the proper adjustment for any other purpose. The form back of the lips, the dimensions, and proper shape and bevel on the outer edges of the lips, has had to be given by other and various means at other times. with my improved machine the edges of the lips, as well as of the pod, are reduced tothe proper dimensions by the automatic action of the machine.

This machine is mounted on a suitable bedor frame, marked A.

B is the buzz or grinder, which may be made of any suitable material.

0 represents the head on which the journal-boxes of the buzz-shaft are supported.

1) is a pulley, by which the buzz is revolved .by a motion independent of the other nioving'parts ofthe machine.

The head 0 is movable transversely-with the frame of the machine on the rarliage E, which is itselt'movable on guides or ways (longitudinally) on the frame A.

F is a screw, which is supported by the ends of the frame on which it revolves, on suitable journals.

G is a female screw or nut, attached .to the under side of the carriage with which the screw engages, and by means of which the carriage and buzz are moved back and forth, according to the motion of the screw.

H and I represent pulleyson the outer end of the screw. One pulley is for an open, and the other is for a cross-belt for turning the screw in opposite directions, and reversing the motion. of the buzz.

J is a clutch-shifter coupling between the pulleys,

which is connected with the arm L.

M M represent adjustable collars on the bar K, and in dotted line in fig. 1 a spiral spring is seen on the bar. On the carriage E there is afiuger, which hangs down between the collars M, and engages with one of them when moving in one direction, and with the spring which acts against the other collar when moving in the other direction.

By this arrangement, the shifting of the bolts and the motion of the carriage is made automatic.

N is a gear-wheel on the opposite end of the screw.

0 is the telescopic shatt seen in section in fig. 2. As seen in the drawing, this shaft is in two parts, 0 and 1 B- R are the stands which support the journal-boxes of the shaft 0 P. A

S is an adjustable stand for receiving and supporting the point of the bit, as seen in fig. 2. i

'1 represents a shaft which is allowed a slight rocking motion on its bearings.

The stand It is jointed to the frame, the shaft T being the joint pivot.

he stands It and S are fastened to the shaft- I. by set-screws, and both may be adjusted on the shaft to suit the length of the bit.

In the part 1 of the telescopic shaft 0, there is a socket for receiving the end of the bit.

U is a set-screw for holding the part P in posit-ion, after the bit has been adjusted.

V is a lever, which is attached to the shaft T, by means of which the shaft is given a slight rocking or revolving motion.

W is a bar attached to the carriage E, and slides on the tinme with the carriage. A short section 11 sliding bar K by the the top of this bar is serrated, or a series of tee h is formed, as seen at x.

The lever V rests on this bar W, as seen in fig. 3.

A short space on the under side 'of the, lever is brought to an edge, so that each separate tooth may engage therewith, and serve to slightly raise the lever as it passes under it.

By thus raising the lever, it will be seen that the shaft '1 will be slightly rocked, and the bit, when in a particular (and the right) position, will be moved from the buzz.

After the point of the tooth has passed thecdge of in the .bit-holder or part 1 the lever, the lever descends or is drawn down: by means of spring, g Y

On the part 1 of the telescopic shaft 0, there is a banal-wheel, Z, for adjusting the bitwith reference to the position of lever V and the. teeth 2 so that, the lateral li'lm'tlnt-llf' ot the bit (produced as already descrihed,) will give the necessary clear to the outsides of the lips.

Z is a gear-wheel-ou the end of the telescopic shaft 0, which engages with the gear-wheel N on the screw.

The shaft 0 and the bit are thus rotated, while the buzz B is moved back and forth to grind the edge and give the. clear to the lips. As the clear must be given to two lips, it will be seen that; the end of the -lever V must; be raised twice for each revolution of the bit, and as'the bit and the screw revolveavith a uniform motion, the pitch of the teeth a: is just half the pitch of the screw.

The entire operation may be described as follows The buzz or grinder B being rotated'at any required speed, the bit. or angur is adjusted in proper position of the telescopic shaft; 0, with the buzz B over its shank. g

The machiue-isgthen set in motion. The buzz and its earnage advance toward the lips of the bit, grinding, as they advance, the edges of the pod to the proper form, the bit being in rotation. As the .bit comes in contact with the conn'nencement; of the bevel on the edge of the. lips, the first tooth :0 on the bar \V engages with and raises the lever V.

This slightly rolls the shaft 0, and turns or moves the hitaway from the buzz moreand more as the lever rises on the tooth. This occurs as the hit in its revolution brings the bevel of the edges oi the lips against the buzz, commencing at the first beginning of the bevel, until the greatest; bevel, at the extremity of the lips, is reached.

The greatest: bevel or swell being passed, the lever V falls or is drawn down by the spring '1, behind the tooth,- and the now decreasing bevel is again adjusted to the action of the buzz. These same actions are repeated as the teeth x on the bar suecessivelyengage' cally reversed by the shifting mechanism before described, and the buzz travels back with the carriage, repeating all the described operationsin the reverse movement, after which the bit; is ready to be removed than the machine.

It will be'ohvious that; unless the bit; is fixed in one exact; position with regard to the movement of the teeth :2 z, and position of the lever, the work would be marred or imperfi-et.

Now the telescopic shaft admits ,ot the bit in the most; perfect and exact; manner to this; eud,'\vhil e the shaft is also readily adjusted to the lengthot the hit, its position being secure by the setscrew U.

As before stated, the buzz or grinder B is adjustable transversely-on theearriage E. The base of the head 0 has a slotwhich allows of the movement. When properly adjusted, it; is hcld in position by means ofthe screw 0'.

Having, thus described my invention,v

I claim as new and desire to secure by Letters Patent I i. In tmmbinatiou with a machine for mauuthctun in; hits, the telescopi substantially as aml for the purposes described.

'2. The. mechanism herein before described for moving the bit laterally from the buzz or grinder for giving the outside clear to the lips of the bit, substantially as set tbrth.

substantially as and for the nn-poses described.

4. in combination;with the telescopic shalt T, the buzz or grinder B, and the carriage E, with the several mechanisms connected therewith, substantially as and for the purposes hereinshown and described.

' JAMES SWAN.

Witnesses:

Joan H. SWAIN,

B. W. SMITH.

with the lever, until theyentire edges have been buzzed over, when the motion oi the machine is automatiof the adjustment e shaft tb'rm ed of the parts 0 P,

5. The teeth a: and lever v for operating the shaft, 

